diff options
Diffstat (limited to 'archival/libunarchive/decompress_unzip.c')
| -rw-r--r-- | archival/libunarchive/decompress_unzip.c | 747 |
1 files changed, 291 insertions, 456 deletions
diff --git a/archival/libunarchive/decompress_unzip.c b/archival/libunarchive/decompress_unzip.c index d840670..20bf88f 100644 --- a/archival/libunarchive/decompress_unzip.c +++ b/archival/libunarchive/decompress_unzip.c @@ -65,114 +65,126 @@ static char *license_msg[] = { #include <signal.h> #include <stdlib.h> #include <string.h> +#include <unistd.h> +#include <fcntl.h> #include "config.h" -#include "libbb.h" +#include "busybox.h" +#include "unarchive.h" -#ifdef CONFIG_FEATURE_UNCOMPRESS -int uncompress(FILE * in, FILE * out); -#endif - -static FILE *in_file, *out_file; +typedef struct huft_s { + unsigned char e; /* number of extra bits or operation */ + unsigned char b; /* number of bits in this code or subcode */ + union { + unsigned short n; /* literal, length base, or distance base */ + struct huft_s *t; /* pointer to next level of table */ + } v; +} huft_t; -/* these are freed by gz_close */ -static unsigned char *window; -static unsigned long *crc_table; +static int gunzip_src_fd; +static int gunzip_dst_fd; +unsigned int gunzip_bytes_out; /* number of output bytes */ +static unsigned int gunzip_outbuf_count; /* bytes in output buffer */ -static unsigned long crc; /* shift register contents */ +/* This is used to sanify any unused bits from the bitbuffer + * so they arent skipped when reading trailers (trailing headers) */ +unsigned char gunzip_in_buffer_count; +unsigned char *gunzip_in_buffer; -/* Return codes from gzip */ -#define ERROR 1 +/* gunzip_window size--must be a power of two, and + * at least 32K for zip's deflate method */ +static const int gunzip_wsize = 0x8000; -/* - * window size--must be a power of two, and - * at least 32K for zip's deflate method - */ -#define WSIZE 0x8000 +static unsigned char *gunzip_window; +static unsigned int *gunzip_crc_table; +unsigned int gunzip_crc; /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */ #define BMAX 16 /* maximum bit length of any code (16 for explode) */ #define N_MAX 288 /* maximum number of codes in any set */ -static long bytes_out; /* number of output bytes */ -static unsigned long outcnt; /* bytes in output buffer */ - -static unsigned hufts; /* track memory usage */ -static unsigned long bb; /* bit buffer */ -static unsigned bk; /* bits in bit buffer */ - -typedef struct huft_s { - unsigned char e; /* number of extra bits or operation */ - unsigned char b; /* number of bits in this code or subcode */ - union { - unsigned short n; /* literal, length base, or distance base */ - struct huft_s *t; /* pointer to next level of table */ - } v; -} huft_t; +static unsigned int gunzip_hufts; /* track memory usage */ +static unsigned int gunzip_bb; /* bit buffer */ +static unsigned char gunzip_bk; /* bits in bit buffer */ static const unsigned short mask_bits[] = { - 0x0000, - 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, + 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff }; -/* static int error_number = 0; */ -/* ======================================================================== - * Signal and error handler. - */ +/* Copy lengths for literal codes 257..285 */ +static const unsigned short cplens[] = { + 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, + 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 +}; + +/* note: see note #13 above about the 258 in this list. */ +/* Extra bits for literal codes 257..285 */ +static const unsigned char cplext[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, + 5, 5, 5, 0, 99, 99 +}; /* 99==invalid */ + +/* Copy offsets for distance codes 0..29 */ +static const unsigned short cpdist[] = { + 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, + 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577 +}; + +/* Extra bits for distance codes */ +static const unsigned char cpdext[] = { + 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, + 11, 11, 12, 12, 13, 13 +}; + +/* Tables for deflate from PKZIP's appnote.txt. */ +/* Order of the bit length code lengths */ +static const unsigned char border[] = { + 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 +}; + +static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required) +{ + while (*current < required) { + bitbuffer |= ((unsigned int) xread_char(gunzip_src_fd)) << *current; + *current += 8; + } + + return(bitbuffer); +} static void abort_gzip(void) { error_msg("gzip aborted\n"); - exit(ERROR); + exit(-1); } -static void make_crc_table(void) +static void make_gunzip_crc_table(void) { - const unsigned long poly = 0xedb88320; /* polynomial exclusive-or pattern */ + const unsigned int poly = 0xedb88320; /* polynomial exclusive-or pattern */ unsigned short i; /* counter for all possible eight bit values */ /* initial shift register value */ - crc = 0xffffffffL; - crc_table = (unsigned long *) malloc(256 * sizeof(unsigned long)); + gunzip_crc = 0xffffffffL; + gunzip_crc_table = (unsigned int *) malloc(256 * sizeof(unsigned int)); /* Compute and print table of CRC's, five per line */ for (i = 0; i < 256; i++) { - unsigned long table_entry; /* crc shift register */ - char k; /* byte being shifted into crc apparatus */ + unsigned int table_entry; /* crc shift register */ + unsigned char k; /* byte being shifted into crc apparatus */ table_entry = i; /* The idea to initialize the register with the byte instead of * zero was stolen from Haruhiko Okumura's ar002 */ for (k = 8; k; k--) { - table_entry = - table_entry & 1 ? (table_entry >> 1) ^ poly : table_entry >> - 1; - } - crc_table[i] = table_entry; + if (table_entry & 1) { + table_entry = (table_entry >> 1) ^ poly; + } else { + table_entry >>= 1; } -} - -/* =========================================================================== - * Write the output window window[0..outcnt-1] and update crc and bytes_out. - * (Used for the decompressed data only.) - */ -static void flush_window(void) -{ - int n; - - if (outcnt == 0) - return; - - for (n = 0; n < outcnt; n++) { - crc = crc_table[((int) crc ^ (window[n])) & 0xff] ^ (crc >> 8); } - - if (fwrite(window, 1, outcnt, out_file) != outcnt) { - error_msg_and_die("Couldnt write"); + gunzip_crc_table[i] = table_entry; } - bytes_out += (unsigned long) outcnt; - outcnt = 0; } /* @@ -183,7 +195,8 @@ static void flush_window(void) */ static int huft_free(huft_t * t) { - huft_t *p, *q; + huft_t *p; + huft_t *q; /* Go through linked list, freeing from the malloced (t[-1]) address. */ p = t; @@ -195,8 +208,6 @@ static int huft_free(huft_t * t) return 0; } -typedef unsigned char extra_bits_t; - /* Given a list of code lengths and a maximum table size, make a set of * tables to decode that set of codes. Return zero on success, one if * the given code set is incomplete (the tables are still built in this @@ -213,7 +224,7 @@ typedef unsigned char extra_bits_t; */ static int huft_build(unsigned int *b, const unsigned int n, const unsigned int s, const unsigned short *d, - const extra_bits_t * e, huft_t ** t, int *m) + const unsigned char *e, huft_t ** t, int *m) { unsigned a; /* counter for codes of length k */ unsigned c[BMAX + 1]; /* bit length count table */ @@ -251,26 +262,35 @@ static int huft_build(unsigned int *b, const unsigned int n, /* Find minimum and maximum length, bound *m by those */ l = *m; - for (j = 1; j <= BMAX; j++) - if (c[j]) + for (j = 1; j <= BMAX; j++) { + if (c[j]) { break; + } + } k = j; /* minimum code length */ - if ((unsigned) l < j) + if ((unsigned) l < j) { l = j; - for (i = BMAX; i; i--) - if (c[i]) + } + for (i = BMAX; i; i--) { + if (c[i]) { break; + } + } g = i; /* maximum code length */ - if ((unsigned) l > i) + if ((unsigned) l > i) { l = i; + } *m = l; /* Adjust last length count to fill out codes, if needed */ - for (y = 1 << j; j < i; j++, y <<= 1) - if ((y -= c[j]) < 0) + for (y = 1 << j; j < i; j++, y <<= 1) { + if ((y -= c[j]) < 0) { return 2; /* bad input: more codes than bits */ - if ((y -= c[i]) < 0) + } + } + if ((y -= c[i]) < 0) { return 2; + } c[i] += y; /* Generate starting offsets into the value table for each length */ @@ -285,8 +305,9 @@ static int huft_build(unsigned int *b, const unsigned int n, p = b; i = 0; do { - if ((j = *p++) != 0) + if ((j = *p++) != 0) { v[x[j]++] = i; + } } while (++i < n); /* Generate the Huffman codes and for each, make the table entries */ @@ -314,8 +335,9 @@ static int huft_build(unsigned int *b, const unsigned int n, f -= a + 1; /* deduct codes from patterns left */ xp = c + k; while (++j < z) { /* try smaller tables up to z bits */ - if ((f <<= 1) <= *++xp) + if ((f <<= 1) <= *++xp) { break; /* enough codes to use up j bits */ + } f -= *xp; /* else deduct codes from patterns */ } } @@ -324,7 +346,7 @@ static int huft_build(unsigned int *b, const unsigned int n, /* allocate and link in new table */ q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t)); - hufts += z + 1; /* track memory usage */ + gunzip_hufts += z + 1; /* track memory usage */ *t = q + 1; /* link to list for huft_free() */ *(t = &(q->v.t)) = NULL; u[h] = ++q; /* table starts after link */ @@ -342,9 +364,9 @@ static int huft_build(unsigned int *b, const unsigned int n, /* set up table entry in r */ r.b = (unsigned char) (k - w); - if (p >= v + n) + if (p >= v + n) { r.e = 99; /* out of values--invalid code */ - else if (*p < s) { + } else if (*p < s) { r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ r.v.n = (unsigned short) (*p); /* simple code is just the value */ p++; /* one compiler does not like *p++ */ @@ -355,12 +377,14 @@ static int huft_build(unsigned int *b, const unsigned int n, /* fill code-like entries with r */ f = 1 << (k - w); - for (j = i >> w; j < z; j += f) + for (j = i >> w; j < z; j += f) { q[j] = r; + } /* backwards increment the k-bit code i */ - for (j = 1 << (k - 1); i & j; j >>= 1) + for (j = 1 << (k - 1); i & j; j >>= 1) { i ^= j; + } i ^= j; /* backup over finished tables */ @@ -374,6 +398,25 @@ static int huft_build(unsigned int *b, const unsigned int n, return y != 0 && g != 1; } +/* =========================================================================== + * Write the output gunzip_window gunzip_window[0..gunzip_outbuf_count-1] and update crc and gunzip_bytes_out. + * (Used for the decompressed data only.) + */ +static void flush_gunzip_window(void) +{ + int n; + + for (n = 0; n < gunzip_outbuf_count; n++) { + gunzip_crc = gunzip_crc_table[((int) gunzip_crc ^ (gunzip_window[n])) & 0xff] ^ (gunzip_crc >> 8); + } + + if (write(gunzip_dst_fd, gunzip_window, gunzip_outbuf_count) != gunzip_outbuf_count) { + error_msg_and_die("Couldnt write"); + } + gunzip_bytes_out += gunzip_outbuf_count; + gunzip_outbuf_count = 0; +} + /* * inflate (decompress) the codes in a deflated (compressed) block. * Return an error code or zero if it all goes ok. @@ -381,32 +424,26 @@ static int huft_build(unsigned int *b, const unsigned int n, * tl, td: literal/length and distance decoder tables * bl, bd: number of bits decoded by tl[] and td[] */ -static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd) +static int inflate_codes(huft_t * tl, huft_t * td, const unsigned int bl, const unsigned int bd) { - register unsigned long e; /* table entry flag/number of extra bits */ - unsigned long n, d; /* length and index for copy */ - unsigned long w; /* current window position */ + unsigned int e; /* table entry flag/number of extra bits */ + unsigned int n, d; /* length and index for copy */ + unsigned int w; /* current gunzip_window position */ huft_t *t; /* pointer to table entry */ - unsigned ml, md; /* masks for bl and bd bits */ - register unsigned long b; /* bit buffer */ - register unsigned k; /* number of bits in bit buffer */ - register int input_char; + unsigned int ml, md; /* masks for bl and bd bits */ + unsigned int b; /* bit buffer */ + unsigned int k; /* number of bits in bit buffer */ /* make local copies of globals */ - b = bb; /* initialize bit buffer */ - k = bk; - w = outcnt; /* initialize window position */ + b = gunzip_bb; /* initialize bit buffer */ + k = gunzip_bk; + w = gunzip_outbuf_count; /* initialize gunzip_window position */ /* inflate the coded data */ ml = mask_bits[bl]; /* precompute masks for speed */ md = mask_bits[bd]; - for (;;) { /* do until end of block */ - while (k < (unsigned) bl) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + while (1) { /* do until end of block */ + b = fill_bitbuffer(b, &k, bl); if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) do { if (e == 99) { @@ -415,20 +452,16 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd) b >>= t->b; k -= t->b; e -= 16; - while (k < e) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + b = fill_bitbuffer(b, &k, e); } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); b >>= t->b; k -= t->b; if (e == 16) { /* then it's a literal */ - window[w++] = (unsigned char) t->v.n; - if (w == WSIZE) { - outcnt = (w), flush_window(); + gunzip_window[w++] = (unsigned char) t->v.n; + if (w == gunzip_wsize) { + gunzip_outbuf_count = (w); + flush_gunzip_window(); w = 0; } } else { /* it's an EOB or a length */ @@ -439,24 +472,13 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd) } /* get length of block to copy */ - while (k < e) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + b = fill_bitbuffer(b, &k, e); n = t->v.n + ((unsigned) b & mask_bits[e]); b >>= e; k -= e; /* decode distance of block to copy */ - while (k < (unsigned) bd) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } - + b = fill_bitbuffer(b, &k, bd); if ((e = (t = td + ((unsigned) b & md))->e) > 16) do { if (e == 99) @@ -464,23 +486,13 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd) b >>= t->b; k -= t->b; e -= 16; - while (k < e) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + b = fill_bitbuffer(b, &k, e); } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); b >>= t->b; k -= t->b; - while (k < e) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + b = fill_bitbuffer(b, &k, e); d = w - t->v.n - ((unsigned) b & mask_bits[e]); b >>= e; k -= e; @@ -489,60 +501,38 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd) do { n -= (e = (e = - WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > n ? n : e); -#if !defined(NOMEMCPY) && !defined(DEBUG) + gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e); + /* copy to new buffer to prevent possible overwrite */ if (w - d >= e) { /* (this test assumes unsigned comparison) */ - memcpy(window + w, window + d, e); + memcpy(gunzip_window + w, gunzip_window + d, e); w += e; d += e; - } else /* do it slow to avoid memcpy() overlap */ -#endif /* !NOMEMCPY */ + } else { + /* do it slow to avoid memcpy() overlap */ + /* !NOMEMCPY */ do { - window[w++] = window[d++]; + gunzip_window[w++] = gunzip_window[d++]; } while (--e); - if (w == WSIZE) { - outcnt = (w), flush_window(); + } + if (w == gunzip_wsize) { + gunzip_outbuf_count = (w); + flush_gunzip_window(); w = 0; } + } while (n); } } /* restore the globals from the locals */ - outcnt = w; /* restore global window pointer */ - bb = b; /* restore global bit buffer */ - bk = k; + gunzip_outbuf_count = w; /* restore global gunzip_window pointer */ + gunzip_bb = b; /* restore global bit buffer */ + gunzip_bk = k; /* done */ return 0; } -static const unsigned short cplens[] = { /* Copy lengths for literal codes 257..285 */ - 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, - 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 -}; - -/* note: see note #13 above about the 258 in this list. */ -static const extra_bits_t cplext[] = { /* Extra bits for literal codes 257..285 */ - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, - 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99 -}; /* 99==invalid */ -static const unsigned short cpdist[] = { /* Copy offsets for distance codes 0..29 */ - 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, - 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, - 8193, 12289, 16385, 24577 -}; -static const extra_bits_t cpdext[] = { /* Extra bits for distance codes */ - 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, - 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, - 12, 12, 13, 13 -}; - -/* Tables for deflate from PKZIP's appnote.txt. */ -static const extra_bits_t border[] = { /* Order of the bit length code lengths */ - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 -}; - /* * decompress an inflated block * e: last block flag @@ -552,53 +542,43 @@ static const extra_bits_t border[] = { /* Order of the bit length code lengths * static int inflate_block(int *e) { unsigned t; /* block type */ - register unsigned long b; /* bit buffer */ - register unsigned k; /* number of bits in bit buffer */ - int input_char; + register unsigned int b; /* bit buffer */ + unsigned int k; /* number of bits in bit buffer */ /* make local bit buffer */ - b = bb; - k = bk; + + b = gunzip_bb; + k = gunzip_bk; /* read in last block bit */ - while (k < 1) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + b = fill_bitbuffer(b, &k, 1); *e = (int) b & 1; b >>= 1; k -= 1; /* read in block type */ - while (k < 2) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b |= ((unsigned long)input_char) << k; - k += 8; - } + b = fill_bitbuffer(b, &k, 2); t = (unsigned) b & 3; b >>= 2; k -= 2; /* restore the global bit buffer */ - bb = b; - bk = k; + gunzip_bb = b; + gunzip_bk = k; /* inflate that block type */ switch (t) { case 0: /* Inflate stored */ { - unsigned long n; /* number of bytes in block */ - unsigned long w; /* current window position */ - register unsigned long b_stored; /* bit buffer */ - register unsigned long k_stored; /* number of bits in bit buffer */ + unsigned int n; /* number of bytes in block */ + unsigned int w; /* current gunzip_window position */ + unsigned int b_stored; /* bit buffer */ + unsigned int k_stored; /* number of bits in bit buffer */ /* make local copies of globals */ - b_stored = bb; /* initialize bit buffer */ - k_stored = bk; - w = outcnt; /* initialize window position */ + b_stored = gunzip_bb; /* initialize bit buffer */ + k_stored = gunzip_bk; + w = gunzip_outbuf_count; /* initialize gunzip_window position */ /* go to byte boundary */ n = k_stored & 7; @@ -606,21 +586,12 @@ static int inflate_block(int *e) k_stored -= n; /* get the length and its complement */ - while (k_stored < 16) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_stored |= ((unsigned long)input_char) << k_stored; - k_stored += 8; - } + b_stored = fill_bitbuffer(b_stored, &k_stored, 16); n = ((unsigned) b_stored & 0xffff); b_stored >>= 16; k_stored -= 16; - while (k_stored < 16) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_stored |= ((unsigned long)input_char) << k_stored; - k_stored += 8; - } + + b_stored = fill_bitbuffer(b_stored, &k_stored, 16); if (n != (unsigned) ((~b_stored) & 0xffff)) { return 1; /* error in compressed data */ } @@ -629,15 +600,11 @@ static int inflate_block(int *e) /* read and output the compressed data */ while (n--) { - while (k_stored < 8) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_stored |= ((unsigned long)input_char) << k_stored; - k_stored += 8; - } - window[w++] = (unsigned char) b_stored; - if (w == (unsigned long) WSIZE) { - outcnt = (w), flush_window(); + b_stored = fill_bitbuffer(b_stored, &k_stored, 8); + gunzip_window[w++] = (unsigned char) b_stored; + if (w == (unsigned int) gunzip_wsize) { + gunzip_outbuf_count = (w); + flush_gunzip_window(); w = 0; } b_stored >>= 8; @@ -645,9 +612,9 @@ static int inflate_block(int *e) } /* restore the globals from the locals */ - outcnt = w; /* restore global window pointer */ - bb = b_stored; /* restore global bit buffer */ - bk = k_stored; + gunzip_outbuf_count = w; /* restore global gunzip_window pointer */ + gunzip_bb = b_stored; /* restore global bit buffer */ + gunzip_bk = k_stored; return 0; } case 1: /* Inflate fixed @@ -659,8 +626,8 @@ static int inflate_block(int *e) int i; /* temporary variable */ huft_t *tl; /* literal/length code table */ huft_t *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ + unsigned int bl; /* lookup bits for tl */ + unsigned int bd; /* lookup bits for td */ unsigned int l[288]; /* length list for huft_build */ /* set up literal table */ @@ -692,8 +659,9 @@ static int inflate_block(int *e) } /* decompress until an end-of-block code */ - if (inflate_codes(tl, td, bl, bd)) + if (inflate_codes(tl, td, bl, bd)) { return 1; + } /* free the decoding tables, return */ huft_free(tl); @@ -705,53 +673,41 @@ static int inflate_block(int *e) const int dbits = 6; /* bits in base distance lookup table */ const int lbits = 9; /* bits in base literal/length lookup table */ - int i; /* temporary variables */ - unsigned j; - unsigned l; /* last length */ - unsigned m; /* mask for bit lengths table */ - unsigned n; /* number of lengths to get */ huft_t *tl; /* literal/length code table */ huft_t *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ - unsigned nb; /* number of bit length codes */ - unsigned nl; /* number of literal/length codes */ - unsigned nd; /* number of distance codes */ - - unsigned ll[286 + 30]; /* literal/length and distance code lengths */ - register unsigned long b_dynamic; /* bit buffer */ - register unsigned k_dynamic; /* number of bits in bit buffer */ + unsigned int i; /* temporary variables */ + unsigned int j; + unsigned int l; /* last length */ + unsigned int m; /* mask for bit lengths table */ + unsigned int n; /* number of lengths to get */ + unsigned int bl; /* lookup bits for tl */ + unsigned int bd; /* lookup bits for td */ + unsigned int nb; /* number of bit length codes */ + unsigned int nl; /* number of literal/length codes */ + unsigned int nd; /* number of distance codes */ + + unsigned int ll[286 + 30]; /* literal/length and distance code lengths */ + unsigned int b_dynamic; /* bit buffer */ + unsigned int k_dynamic; /* number of bits in bit buffer */ /* make local bit buffer */ - b_dynamic = bb; - k_dynamic = bk; + b_dynamic = gunzip_bb; + k_dynamic = gunzip_bk; /* read in table lengths */ - while (k_dynamic < 5) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */ + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 5); + nl = 257 + ((unsigned int) b_dynamic & 0x1f); /* number of literal/length codes */ + b_dynamic >>= 5; k_dynamic -= 5; - while (k_dynamic < 5) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */ + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 5); + nd = 1 + ((unsigned int) b_dynamic & 0x1f); /* number of distance codes */ + b_dynamic >>= 5; k_dynamic -= 5; - while (k_dynamic < 4) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */ + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 4); + nb = 4 + ((unsigned int) b_dynamic & 0xf); /* number of bit length codes */ + b_dynamic >>= 4; k_dynamic -= 4; if (nl > 286 || nd > 30) { @@ -760,13 +716,8 @@ static int inflate_block(int *e) /* read in bit-length-code lengths */ for (j = 0; j < nb; j++) { - while (k_dynamic < 3) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - ll[border[j]] = (unsigned) b_dynamic & 7; + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3); + ll[border[j]] = (unsigned int) b_dynamic & 7; b_dynamic >>= 3; k_dynamic -= 3; } @@ -776,7 +727,8 @@ static int inflate_block(int *e) /* build decoding table for trees--single level, 7 bit lookup */ bl = 7; - if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) { + i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl); + if (i != 0) { if (i == 1) { huft_free(tl); } @@ -787,46 +739,31 @@ static int inflate_block(int *e) n = nl + nd; m = mask_bits[bl]; i = l = 0; - while ((unsigned) i < n) { - while (k_dynamic < (unsigned) bl) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - j = (td = tl + ((unsigned) b_dynamic & m))->b; + while ((unsigned int) i < n) { + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, (unsigned int)bl); + j = (td = tl + ((unsigned int) b_dynamic & m))->b; b_dynamic >>= j; k_dynamic -= j; j = td->v.n; if (j < 16) { /* length of code in bits (0..15) */ ll[i++] = l = j; /* save last length in l */ } else if (j == 16) { /* repeat last length 3 to 6 times */ - while (k_dynamic < 2) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - j = 3 + ((unsigned) b_dynamic & 3); + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 2); + j = 3 + ((unsigned int) b_dynamic & 3); b_dynamic >>= 2; k_dynamic -= 2; - if ((unsigned) i + j > n) { + if ((unsigned int) i + j > n) { return 1; } while (j--) { ll[i++] = l; } } else if (j == 17) { /* 3 to 10 zero length codes */ - while (k_dynamic < 3) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - j = 3 + ((unsigned) b_dynamic & 7); + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3); + j = 3 + ((unsigned int) b_dynamic & 7); b_dynamic >>= 3; k_dynamic -= 3; - if ((unsigned) i + j > n) { + if ((unsigned int) i + j > n) { return 1; } while (j--) { @@ -834,16 +771,11 @@ static int inflate_block(int *e) } l = 0; } else { /* j == 18: 11 to 138 zero length codes */ - while (k_dynamic < 7) { - input_char = fgetc(in_file); - if (input_char == EOF) return 1; - b_dynamic |= ((unsigned long)input_char) << k_dynamic; - k_dynamic += 8; - } - j = 11 + ((unsigned) b_dynamic & 0x7f); + b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 7); + j = 11 + ((unsigned int) b_dynamic & 0x7f); b_dynamic >>= 7; k_dynamic -= 7; - if ((unsigned) i + j > n) { + if ((unsigned int) i + j > n) { return 1; } while (j--) { @@ -857,22 +789,24 @@ static int inflate_block(int *e) huft_free(tl); /* restore the global bit buffer */ - bb = b_dynamic; - bk = k_dynamic; + gunzip_bb = b_dynamic; + gunzip_bk = k_dynamic; /* build the decoding tables for literal/length and distance codes */ bl = lbits; + if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) { if (i == 1) { - error_msg("Incomplete literal tree"); + error_msg_and_die("Incomplete literal tree"); huft_free(tl); } return i; /* incomplete code set */ } + bd = dbits; if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) { if (i == 1) { - error_msg("incomplete distance tree"); + error_msg_and_die("incomplete distance tree"); huft_free(td); } huft_free(tl); @@ -880,8 +814,9 @@ static int inflate_block(int *e) } /* decompress until an end-of-block code */ - if (inflate_codes(tl, td, bl, bd)) + if (inflate_codes(tl, td, bl, bd)) { return 1; + } /* free the decoding tables, return */ huft_free(tl); @@ -890,6 +825,7 @@ static int inflate_block(int *e) } default: /* bad block type */ + error_msg("bad block type %d\n", t); return 2; } } @@ -897,72 +833,24 @@ static int inflate_block(int *e) /* * decompress an inflated entry * - * GLOBAL VARIABLES: outcnt, bk, bb, hufts, inptr + * GLOBAL VARIABLES: gunzip_outbuf_count, bk, gunzip_bb, hufts, inptr */ -extern int inflate(FILE * in, FILE * out) +extern int inflate(int in, int out) { + typedef void (*sig_type) (int); int e; /* last block flag */ int r; /* result code */ unsigned h = 0; /* maximum struct huft's malloc'ed */ - /* initialize window, bit buffer */ - outcnt = 0; - bk = 0; - bb = 0; - - in_file = in; - out_file = out; - /* Allocate all global buffers (for DYN_ALLOC option) */ - window = xmalloc((size_t) (((2L * WSIZE) + 1L) * sizeof(unsigned char))); - bytes_out = 0L; + gunzip_window = xmalloc(0x8000); + gunzip_outbuf_count = 0; + gunzip_bytes_out = 0; - /* Create the crc table */ - make_crc_table(); + gunzip_src_fd = in; + gunzip_dst_fd = out; - /* decompress until the last block */ - do { - hufts = 0; - if ((r = inflate_block(&e)) != 0) { - return r; - } - if (hufts > h) { - h = hufts; - } - } while (!e); - - /* Undo too much lookahead. The next read will be byte aligned so we - * can discard unused bits in the last meaningful byte. - */ - while (bk >= 8) { - bk -= 8; - ungetc((bb << bk), in_file); - } - - /* flush out window */ - flush_window(); - free(window); - free(crc_table); - - /* return success */ - return 0; -} - -/* =========================================================================== - * Unzip in to out. This routine works on gzip files only. - * - * IN assertions: the buffer inbuf contains already the beginning of - * the compressed data, from offsets inptr to insize-1 included. - * The magic header has already been checked. The output buffer is cleared. - * in, out: input and output file descriptors - */ -extern int unzip(FILE * l_in_file, FILE * l_out_file) -{ - unsigned char buf[8]; /* extended local header */ - unsigned char flags; /* compression flags */ - typedef void (*sig_type) (int); - unsigned short i; - unsigned char magic[2]; + gunzip_in_buffer = malloc(8); if (signal(SIGINT, SIG_IGN) != SIG_IGN) { (void) signal(SIGINT, (sig_type) abort_gzip); @@ -973,97 +861,44 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file) } #endif - magic[0] = fgetc(l_in_file); - magic[1] = fgetc(l_in_file); - -#ifdef CONFIG_FEATURE_UNCOMPRESS - /* Magic header for compress files, 1F 9d = \037\235 */ - if ((magic[0] == 0x1F) && (magic[1] == 0x9d)) { - return uncompress(l_in_file, l_out_file); - } -#endif - - /* Magic header for gzip files, 1F 8B = \037\213 */ - if ((magic[0] != 0x1F) || (magic[1] != 0x8b)) { - error_msg("Invalid gzip magic"); - return EXIT_FAILURE; - } - - /* Check the compression method */ - if (fgetc(l_in_file) != 8) /* also catches EOF */ { - error_msg("Unknown compression method"); - return (-1); - } - - flags = (unsigned char) fgetc(l_in_file); - - /* Ignore time stamp(4), extra flags(1), OS type(1) */ - for (i = 0; i < 6; i++) { - fgetc(l_in_file); - } + /* initialize gunzip_window, bit buffer */ + gunzip_bk = 0; + gunzip_bb = 0; - if (flags & 0x04) { - /* bit 2 set: extra field present */ - const unsigned short extra = - fgetc(l_in_file) + (fgetc(l_in_file) << 8); - if (feof(in_file)) return 1; - for (i = 0; i < extra; i++) { - fgetc(l_in_file); - } - } - - /* Discard original name if any */ - if (flags & 0x08) { - /* bit 3 set: original file name present */ - while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */ - } + /* Create the crc table */ + make_gunzip_crc_table(); - /* Discard file comment if any */ - if (flags & 0x10) { - /* bit 4 set: file comment present */ - while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */ + /* decompress until the last block */ + do { + gunzip_hufts = 0; + r = inflate_block(&e); + if (r != 0) { + error_msg_and_die("inflate error %d", r); + return r; } - - /* Decompress */ - if (inflate(l_in_file, l_out_file) != 0) { - error_msg("invalid compressed data--format violated"); + if (gunzip_hufts > h) { + h = gunzip_hufts; } + } while (!e); - /* Get the crc and original length - * crc32 (see algorithm.doc) - * uncompressed input size modulo 2^32 - */ - fread(buf, 1, 8, l_in_file); - - /* Validate decompression - crc */ - if ((unsigned int) ((buf[0] | (buf[1] << 8)) | - ((buf[2] | (buf[3] << 8)) << 16)) != - (crc ^ 0xffffffffL)) { - error_msg("invalid compressed data--crc error"); - } - /* Validate decompression - size */ - if (((buf[4] | (buf[5] << 8)) | ((buf[6] | (buf[7] << 8)) << 16)) != - (unsigned long) bytes_out) { - error_msg("invalid compressed data--length error"); + /* write any buffered uncompressed data */ + flush_gunzip_window(); + free(gunzip_window); + + /* Cleanup */ + free(gunzip_crc_table); + + /* Store unused bytes in a global buffer so calling applets can access it */ + gunzip_in_buffer_count = 0; + if (gunzip_bk >= 8) { + /* Undo too much lookahead. The next read will be byte aligned + * so we can discard unused bits in the last meaningful byte. */ + gunzip_in_buffer[gunzip_in_buffer_count] = gunzip_bb & 0xff; + gunzip_in_buffer_count++; + gunzip_bb >>= 8; + gunzip_bk -= 8; } + /* return success */ return 0; } - -/* - * This needs access to global variables window and crc_table, so its not in its own file. - */ -extern void gz_close(int gunzip_pid) -{ - if (kill(gunzip_pid, SIGTERM) == -1) { - error_msg_and_die - ("*** Couldnt kill old gunzip process *** aborting"); - } - - if (waitpid(gunzip_pid, NULL, 0) == -1) { - printf("Couldnt wait ?"); - } - - free(window); - free(crc_table); -} |